VLANs with different MAC address than parent interface
In FreeBSD it is possible to host an vlan(4) with a different mac address from the parent.
This needs the parent interface in promiscuous mode, which at present days is not much of a issue.
Linked report here http://forum.pfsense.org/index.php/topic,34094.0.html.
Possibly an option should be given to people activate this issue.
#4 Updated by Steve Beaver over 2 years ago
- Status changed from Feedback to 13
James Dekker [6:49 PM]
With SG-5100 and XG-2758 on `2.4.4.a.20180824.1144` (which isn't the latest build, but should include whatever the fix was on `1337`) .. added a VLAN, assigned it as an interface with a static IP on both appliances, enabled the parent interface (no IP set, just enabled so the VLANs could use the interfaces) ... added a allow any rule on the VLAN interface on both pfSense. From either pfSense, I could ping the other. Then on one, I spoofed the VLAN interface mac as `DE:AD:BE:EF:CA:FE`, went to ping and now it fails. Remove the spoofed MAC, pings succeed again.
I his a valid test?
It's possible to do this by editing /etc/inc/interfaces.inc and adding the lines below, but it would be nice if it could be done through the UI.
mwexec("/sbin/ifconfig igb0 promisc");
mwexec("/sbin/ifconfig igb0.10 promisc");
mwexec("/sbin/ifconfig igb0.10 ether 00:aa:bb:cc:dd:ee");
#10 Updated by Renato Botelho 7 months ago
- Target version changed from 2.5.0 to Future
Setting the interface in promiscuous mode is not the way to go and without it FreeBSD don't offer a way to make it to work. At least not today. Moving it to Future and we can target it to a version when we have a proper way of doing that